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Simplifying 90 = 6x + (x + 13) Reorder the terms: 90 = 6x + (13 + x) Remove parenthesis around (13 + x) 90 = 6x + 13 + x Reorder the terms: 90 = 13 + 6x + x Combine like terms: 6x + x = 7x 90 = 13 + 7x Solving 90 = 13 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 90 + -7x = 13 + 7x + -7x Combine like terms: 7x + -7x = 0 90 + -7x = 13 + 0 90 + -7x = 13 Add '-90' to each side of the equation. 90 + -90 + -7x = 13 + -90 Combine like terms: 90 + -90 = 0 0 + -7x = 13 + -90 -7x = 13 + -90 Combine like terms: 13 + -90 = -77 -7x = -77 Divide each side by '-7'. x = 11 Simplifying x = 11
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